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NoSleep is a tool that permits you to keep your MacBook, MacBook Pro, or MacBook Air operating even after you have closed the lid. This can be particularly useful if you are the kind of person that needs to let your computer work while you are asleep or when you want to take your computer with you somewhere. It’s great for taking the computer places so that you can close the lid even though you want it to continue processing whatever it was processing when you had it opened up. It's also great for servers if you just happen to use your MacBook for one. If you use your MacBook as a base computer but like to attach it to an external display, then you will appreciate this application.

The usefulness of NoSleep is open for discussion because if you want to let your computer run while you are trying to sleep, it is simple enough to merely reduce your backlight brightness to zero while the computer finishes what it has to do. Apart from that, the MacBook (no matter the model) will not continue to run after you have closed it up. Instead, it will go into a power-saving sleep mode.

NoSleep comes with a settings pane (shown below) that is accessible from System Preferences on your Mac (>System Preferences) that permits you change some settings. The settings are limited – only two checkboxes. One being ‘Do not fall asleep when lid is closed’ which as it states, keeps your MacBook from going into the low-power sleep mode when you close your MacBook; the second option being ‘Start NoSleep utility on system startup’, which allows the program execute every time you boot up the computer so that you’re ready to use it without having to open it up every time.

Apart from the System Preferences pane, a menu bar icon (shown below) is also supplied which permits you to enable and disable NoSleep on demand. It assists you in discerning the working status of NoSleep. The gray, colorless icon indicates that NoSleep is not enabled. The blue, lit icon indicates that NoSleep is enabled and will keep your MacBook from falling asleep when you close it. Along with most of Mac OS X's menu bar icons, NoSleep's icon isn't that bad looking.

NoSleep is a free application that can be downloaded from this link. If you decide that you don’t like its functionality after installing it, you can uninstall NoSleep by executing the uninstaller package that is encompassed within the '.dmg' file that you downloaded. It's also a good idea to reboot after doing so. The developer of the application states that he is open for suggestions for improving it whether your suggestions are for bug fixes or for feature requests.

The newest version (1.2.1) comes with a bug fix and improvement from the previous version (1.2):

Uhhh... I always thought it was a terrible idea to have your computer running with the lid closed. The majority of heat is vented through the keyboard, so there's a good chance that your macbook can overheat if you use this. On top of that, it's probably not a good idea to transport your computer while it's running, but that's just me.

Will, I was thinking the same. This isnt the first app for this. Lets get a couple of things right here. Yes most of the laptops heat is vented through the keyboard and that it very known about macbooks, on top of that it would just drain your battery and if you machine some how does reach an extreme heat it will auto-shutoff as a security precaution to protect the hardware. As for the walking around with the lid closed from place to place, If you have a SSD like me then no worries use your machine upside down or as you please, if you have a harddrive it is like putting a dvd into your drive start burning a movie then flip your mac then see how that disc is at the end, same deal. As much as id like to be able to close my lid and walk upstairs during skype cov, i will not risk my mac. HORRIBLE IDEA. STAY AWAY. MMI i cant believe you'd suggest to get an app like this w/o knowing the consequences to it.

Will, I was thinking the same. This isnt the first app for this. Lets get a couple of things right here. Yes most of the laptops heat is vented through the keyboard and that it very known about macbooks, on top of that it would just drain your battery and if you machine some how does reach an extreme heat it will auto-shutoff as a security precaution to protect the hardware. As for the walking around with the lid closed from place to place, If you have a SSD like me then no worries use your machine upside down or as you please, if you have a harddrive it is like putting a dvd into your drive start burning a movie then flip your mac then see how that disc is at the end, same deal. As much as id like to be able to close my lid and walk upstairs during skype cov, i will not risk my mac. HORRIBLE IDEA. STAY AWAY. MMI i cant believe you'd suggest to get an app like this w/o knowing the consequences to it.

Most model laptops can't even dissipate the heat that the CPU creates if on full load for extended periods of time, when this happens it begins to slow down the processor so that it produces less heat. Besides all that I'm pretty sure that the air vents on macbooks are behind the display hinge that has air flow from both sides of the monitor and would not be blocked... Soooo... I think your SIZE 5 BOLD FONT. may be unnecessary and a little over the top.

Will, I was thinking the same. This isnt the first app for this. Lets get a couple of things right here. Yes most of the laptops heat is vented through the keyboard and that it very known about macbooks, on top of that it would just drain your battery and if you machine some how does reach an extreme heat it will auto-shutoff as a security precaution to protect the hardware. As for the walking around with the lid closed from place to place, If you have a SSD like me then no worries use your machine upside down or as you please, if you have a harddrive it is like putting a dvd into your drive start burning a movie then flip your mac then see how that disc is at the end, same deal. As much as id like to be able to close my lid and walk upstairs during skype cov, i will not risk my mac. HORRIBLE IDEA. STAY AWAY. MMI i cant believe you'd suggest to get an app like this w/o knowing the consequences to it.

Most model laptops can't even dissipate the heat that the CPU creates if on full load for extended periods of time, when this happens it begins to slow down the processor so that it produces less heat. Besides all that I'm pretty sure that the air vents on macbooks are behind the display hinge that has air flow from both sides of the monitor and would not be blocked... Soooo... I think your SIZE 5 BOLD FONT. may be unnecessary and a little over the top.

Clearly I know nothing. Ill keep the facts to myself next time.

Oh BTW here is Apple Care phone number i hope you purchased support and they cover stupidity.

Oh BTW here is Apple Care phone number i hope you purchased support and they cover stupidity.

1-800-MY-APPLE

I'm quite surprised that OSX doesn't have this as a built in feature, but a computer mostly idling won't make your computer melt down. It's actually quite pathetic that you need an application just to run your rig while it's shut.

Considering the years I ran my T60 in a dock as a workstation with the lid closed and never had any issues, you're fear-mongering just a bit. I do the same with my netbook and other machines in the past without a hint of trouble.

Will, I was thinking the same. This isnt the first app for this. Lets get a couple of things right here. Yes most of the laptops heat is vented through the keyboard and that it very known about macbooks, on top of that it would just drain your battery and if you machine some how does reach an extreme heat it will auto-shutoff as a security precaution to protect the hardware. As for the walking around with the lid closed from place to place, If you have a SSD like me then no worries use your machine upside down or as you please, if you have a harddrive it is like putting a dvd into your drive start burning a movie then flip your mac then see how that disc is at the end, same deal. As much as id like to be able to close my lid and walk upstairs during skype cov, i will not risk my mac. HORRIBLE IDEA. STAY AWAY. MMI i cant believe you'd suggest to get an app like this w/o knowing the consequences to it.

Vents for the MacBooks are in the rear where the fans push the heat out. The keyboard doesn't have any vents in it. It's closed off. Heat rises, sure, but the fans do a decent job of flattening the heat. You can also use fan utilities to manually control the fan if you're absolutely worried about heat.

Warning to Macbook users: Closing the lid and thus inhibiting most of the heat dissipation of the laptop (recall that nice toasty top left side above the esc key?) while running very CPU-intensive operations can be EXTREMELY DANGEROUS.

Vents for the MacBooks are in the rear where the fans push the heat out. The keyboard doesn't have any vents in it. It's closed off. Heat rises, sure, but the fans do a decent job of flattening the heat. You can also use fan untilies to manually control the fan if you're absolutely worried about heat.

And there you have it! Perfectly safe! I too am shocked that this is not a built in feature, as it is with pcs. I feel like all of these people with such strong opinions about how closing the lid will DESTROY your computer and start World War 3, are just trying to justify why their favorite operating system and incredibly expensive computer(s) don't come with such a simple, useful feature.

And there you have it! Perfectly safe! I too am shocked that this is not a built in feature, as it is with pcs. I feel like all of these people with such strong opinions about how closing the lid will DESTROY your computer and start World War 3, are just trying to justify why their favorite operating system and incredibly expensive computer(s) don't come with such a simple, useful feature.

It's not a high demand feature. Not a ton of computer users demand this functionality. But like every other device on the market, if the device cannot do it, there's an app for that

Will, I was thinking the same. This isnt the first app for this. Lets get a couple of things right here. Yes most of the laptops heat is vented through the keyboard and that it very known about macbooks, on top of that it would just drain your battery and if you machine some how does reach an extreme heat it will auto-shutoff as a security precaution to protect the hardware. As for the walking around with the lid closed from place to place, If you have a SSD like me then no worries use your machine upside down or as you please, if you have a harddrive it is like putting a dvd into your drive start burning a movie then flip your mac then see how that disc is at the end, same deal. As much as id like to be able to close my lid and walk upstairs during skype cov, i will not risk my mac. HORRIBLE IDEA. STAY AWAY. MMI i cant believe you'd suggest to get an app like this w/o knowing the consequences to it.

Weird how some will say this is bad. 1st Apple has a very good SMS that parks the HD when it's needed. 2nd i use my 2011 MBP 16gb ram and SSD as a desk top replacement with a tbolt apl monitor and my lid is closed all the time. No issues and my temp reading stays the same as if the lid was open. Now the built in feature (not using 2nd party) turns off the monitor which I am sure helps dissipate heat vented from the keyboard.

Oh BTW here is Apple Care phone number i hope you purchased support and they cover stupidity.

1-800-MY-APPLE

hitman10 is completely right. This type of program is not a new idea Ive been using similar programs, eg. insomniax, and ?coffeebreak?. The following is very simple and I hope that all that read this article get to see this comment....

The two most efficient ways heat dissipates from the the MacBook Pros, Air is through A. The keyboard and B. [Primarily] the exhaust for the system fan, that lies behind the hinge.

When you close your Macbook, you inhibit not only the air from escaping through the keyboard, but from the hinge; go ahead and look!! [I do not suggest doing this while your computer is on if you do not have an SSD] flip if over and close the lid, the area of the hole when closed behind the hinge is just a fraction of the width when the lid is open. This will cause more heat to build up and your system to run very hot.

Like I said, I have used on these types of apps when using previous at a desk and using an external monitor. Note, *previous. I have had TWO macbook pros replaced because of these types of programs. Both times the display, fan, and logic board(apparently because of damaged heat syncs) had to be replaced. Running your computer in these conditions causes heat to build up and exit up through the keyboard right against the display. It will eventually cause discoloration of the display (in the shape of the fan). I have pics if anyone needs proof for some reason.

Use this program at your own risk, I can't stop your from using it but I will recommend that if you do only use if for short duration, and nothing that puts a strain on the CPU.

I also am disappointed in MMi that this made the news, not only is this nothing new, but its also already known to cause problems with MacBooks. So why i ask is it being recommended to anyone?

I apologize for mispellings etc. I typed this in a hurry because i have test tmrw morning and i would rather be studying, I just couldn't let a ton of readers harm their MacBooks due to being misinformed.

OKAY DON'T DO THIS
There is another program just like this a while back I'm sure it's not gone yet

the problem with these programs is that your Mac gets incredibly HOT in less then 10Min because the wind current flows from the keyboard out the back of the Mac and when the MacBook is closed it cannot cool itself properly leading to overheating and eventually killing things like hard drive fans motherboard

OKAY DON'T DO THIS
There is another program just like this a while back I'm sure it's not gone yet

the problem with these programs is that your Mac gets incredibly HOT in less then 10Min because the wind current flows from the keyboard out the back of the Mac and when the MacBook is closed it cannot cool itself properly leading to overheating and eventually killing things like hard drive fans motherboard

This was true for my MacBook pro 2008 15inch

Lol. Okay, well the 2009+ MacBook Pro models don't have ventilation through the keyboard so it won't make much of a difference. Please stop spreading these false rumors that cite all MacBooks vent through the keyboard. Ventilation goes through the rear because of the fans... the rest of the computer is sealed off. Image by iFixit: